/**
需求
1. 把默认数据显示到表格上   v-for
2. 注意资产超过100的, 都用红色字体标记出来   :class
3. 点击删除的a标签, 删除数据；无数据提示   @click.prevent
4. 实现底部添加资产的功能    v-model

细节:
1. 注意a标签有默认行为-跳转刷新页面(如果有href属性)
2. 添加资产时, 提示用户数据不能为空
3. form表单里的button的点击事件, 会触发默认表单提交的行为
 */
<template>
  <div id="app">
    <div class="container">
      <!-- 顶部搜索框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(item, index) in list" :key="index">
            <td>{{ item.id }}</td>
            <td>{{ item.name }}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{ red: item.price > 100 }">{{ item.price }}</td>
            <td>{{ item.time | formateDate }}</td>
            <td><a href="#" @click.prevent="rem(index)">删除</a></td>
          </tr>
          <!-- 总价和平均价 -->
          <tr>
            <td>统计</td>
            <td colspan="2">总价：{{ totalPrice }}</td>
            <td colspan="2">均价：{{ advPrice }}</td>
          </tr>
        </tbody>
        <tfoot v-show="list.length === 0">
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              v-model.trim="name"
              type="text"
              class="form-control"
              placeholder="资产名称"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              v-model.trim.number="price"
              type="text"
              class="form-control"
              placeholder="价格"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="add">添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>
import "bootstrap/dist/css/bootstrap.css"; // 局部样式
import moment from "moment";
export default {
  data() {
    return {
      name: "", // 名称
      price: "", // 价格
      // list: [
      //   { id: 100, name: "外套", price: 199, time: new Date("2010-08-12") },
      //   { id: 101, name: "裤子", price: 34, time: new Date("2013-09-01") },
      //   { id: 102, name: "鞋", price: 25.4, time: new Date("2018-11-22") },
      //   { id: 103, name: "头发", price: 19900, time: new Date("2020-12-12") },
      // ],
      list: JSON.parse(localStorage.getItem("brand")) || [],
    };
  },
  methods: {
    rem(index) {
      this.list.splice(index, 1);
    },
    add() {
      // 校验
      if (!this.name || this.price.length === 0) {
        return alert("名称和价格不能为空，请重新输入！");
      }
      if (this.price <= 0) {
        return alert("请输入正确的价格！");
      }
      this.list.push({
        id: this.list[this.list.length - 1].id + 1,
        name: this.name,
        price: this.price,
        time: new Date(),
      });
      this.name = "";
      this.price = "";
    },
  },
  filters: {
    formateDate(value) {
      return moment(value).format("YYYY-MM-DD");
    },
  },
  computed: {
    totalPrice() {
      return this.list.reduce((acc, cur) => (acc += cur.price), 0);
    },
    advPrice() {
      return this.totalPrice / this.list.length;
    },
  },
  watch: {
    list: {
      handler(newList) {
        console.log(newList);
        localStorage.setItem("brand", JSON.stringify(newList));
      },
      deep: true,
      immediate: true,
    },
  },
};
</script>

<style >
.red {
  color: red;
}
</style>